using System;
using System.IO;
using iText.Kernel.Geom;
using iText.Kernel.Pdf;
using iText.Kernel.Pdf.Canvas;

namespace Tutorial.Chapter02 {
    /// <summary>Simple drawing lines example.</summary>
    public class C02E01_Axes {
        public const String DEST = "../../../results/chapter02/axes.pdf";

        public static void Main(String[] args) {
            FileInfo file = new FileInfo(DEST);
            file.Directory.Create();
            new C02E01_Axes().CreatePdf(DEST);
        }

        public virtual void CreatePdf(String dest) {
            //Initialize PDF document
            PdfDocument pdf = new PdfDocument(new PdfWriter(dest));
            PageSize ps = PageSize.A4.Rotate();
            PdfPage page = pdf.AddNewPage(ps);
            PdfCanvas canvas = new PdfCanvas(page);
            //Replace the origin of the coordinate system to the center of the page
            canvas.ConcatMatrix(1, 0, 0, 1, ps.GetWidth() / 2, ps.GetHeight() / 2);
            C02E01_Axes.DrawAxes(canvas, ps);
            //Close document
            pdf.Close();
        }

        public static void DrawAxes(PdfCanvas canvas, PageSize ps) {
            //Draw X axis
            canvas.MoveTo(-(ps.GetWidth() / 2 - 15), 0).LineTo(ps.GetWidth() / 2 - 15, 0).Stroke();
            //Draw X axis arrow
            canvas.SetLineJoinStyle(PdfCanvasConstants.LineJoinStyle.ROUND).MoveTo(ps.GetWidth() / 2 - 25, -10).LineTo
                (ps.GetWidth() / 2 - 15, 0).LineTo(ps.GetWidth() / 2 - 25, 10).Stroke().SetLineJoinStyle(PdfCanvasConstants.LineJoinStyle
                .MITER);
            //Draw Y axis
            canvas.MoveTo(0, -(ps.GetHeight() / 2 - 15)).LineTo(0, ps.GetHeight() / 2 - 15).Stroke();
            //Draw Y axis arrow
            canvas.SaveState().SetLineJoinStyle(PdfCanvasConstants.LineJoinStyle.ROUND).MoveTo(-10, ps.GetHeight() / 2
                 - 25).LineTo(0, ps.GetHeight() / 2 - 15).LineTo(10, ps.GetHeight() / 2 - 25).Stroke().RestoreState();
            //Draw X serif
            for (int i = -((int)ps.GetWidth() / 2 - 61); i < ((int)ps.GetWidth() / 2 - 60); i += 40) {
                canvas.MoveTo(i, 5).LineTo(i, -5);
            }
            //Draw Y serif
            for (int j = -((int)ps.GetHeight() / 2 - 57); j < ((int)ps.GetHeight() / 2 - 56); j += 40) {
                canvas.MoveTo(5, j).LineTo(-5, j);
            }
            canvas.Stroke();
        }
    }
}